ECHINODERMA TA. 



171 



free-swimming, has a mouth and anus, and four parallel 

 bands of cilia arranged transversely to the length of 



Fi^.41.— Holothuri an (Sea-encumber), CucM- 

 ■maria Planci, with its tentacles expanded; 

 twice natural size. 



Pig. 42.— A Crinold; tlio pentacrinoid larva of the Rosy 

 Feather-star, Comatula rosacea, 



the body. The rudiments of the adult form are 

 developed within it while it is still free : afterwards it 



